The value of 'spin only' magnetic moment for one of the following configuration is `2.84B.M.` The correct one is:

Options

A. `d^(4)` (in strong ligand field )
B. `d^(4)` (in weak ligand field )
C. `d^(3)` (in weak as well as in strong fields)
D. `d^(5)` (in strong ligand field )

Answer

A

Explanation

Spin only magnetic moment = `sqrt(n(n+ 2))` B.M.
Where , n = no. of unpaired electrons .
Given , `sqrt(n(n + 2)) = 2.84`
or , `n (n + 2) = 8.0656`
or , n = 2
In an octahedral complex , for a `d^(4)` configuration in a strong field ligand , number of unpaired electrons = 2